CN214944183U

CN214944183U - Downhole casing sand blocking device

Info

Publication number: CN214944183U
Application number: CN202121120651.6U
Authority: CN
Inventors: 樊传忠; 肖文科
Original assignee: Salt Industry Geological Exploration Brigade Of China Salt Industry Corp
Current assignee: Salt Industry Geological Exploration Brigade Of China Salt Industry Corp
Priority date: 2021-05-24
Filing date: 2021-05-24
Publication date: 2021-11-30
Anticipated expiration: 2031-05-24

Abstract

The utility model relates to a sand blocking device for an underground casing, which comprises a pipe body and a plurality of sand blocking components, wherein joints are arranged at two ends of the pipe body, a plurality of through holes are arranged on the pipe body, and the included angle between the central axis of each through hole and the inner surface of the pipe body is an acute angle; the sand blocking component is positioned in the pipe body; the sand blocking assembly comprises an installation part and a sand blocking part, and the installation part is arranged in the through hole; hinder sand portion and include many steel wires, the first end of many steel wires all is connected with the installation department, and the second end of many steel wires separates each other to be the form of dispersing. Utilize bionics principle, implant steel wire or the hair form material of similar human vibrissa structure at the inner wall of body, when sand grain flowed through the body along with brine, the prevention of steel wire on the sand blocking subassembly can't get into the sleeve pipe, and brine gets into in the sleeve pipe through the clearance of steel wire. Salt crystals, rust and scale layer stripping matters generated in a shaft are attached to the steel wire and need to be discharged into the dissolution cavity through reverse circulation washing, and the cleaning efficiency and the cleaning quality are effectively improved due to the inclined arrangement of the sand prevention assembly.

Description

Downhole casing sand blocking device

Technical Field

The utility model relates to a salt mine exploitation technical field especially relates to a sleeve pipe hinders sand device in pit.

Background

The well drilling water soluble mining method is a relatively common method for mining salt deposit. There are two main types of single well circulation and well group circulation mining processes. The common characteristics are that the solvent-fresh water is injected into the well, the fresh water dissolves the salt deposit to generate salt water solution (brine in the salt deposit mining industry), and the brine is lifted to the ground along the shaft through the excess pressure of water injection.

The size of a cavity generated by well drilling and solution mining is large, the strength of the salt mine and the salt mine surrounding rock is low, and a salt layer and a top plate collapse along with the development of the cavity in the water injection and solution mining process. High-pressure water injection permeates into cracks around the dissolution cavity, and the collapse of a salt bed and surrounding rocks is aggravated. Particularly, in the process of mining new salt mine generation, because the roof cannot be well formed into rock or more impurities are in a salt mine layer, a large amount of rock debris insoluble substances are generated in the process of mining salt, the rock debris moves along with brine, a shaft is often blocked, brine mining production is seriously influenced, and even a brine well is scrapped. The method is more typical like salt mines in east-Shandong basin in China, and the blockage of the shaft has not been successful so far; salt mine in the Henan Puyang basin, almost all paralyzed; in salt mine of Ningjin in Hebei, brine well blockage often occurs. Brine well blockage also occurs in other salt mines such as Jiangxi, Anhui, etc. In particular, almost all salt mines adopt horizontal butt-jointed wells for brine extraction at present, and because the gradient of a casing at the lower part of a horizontal well is gentle, rock debris can easily enter the casing and rise along the casing, so that the blockage is caused at the well section of a vertical well.

The existing sand blocking device can be a filter screen pipe and the like generally, but salt crystals can be generated and grow continuously when salt exploitation is carried out along with the rising of brine in a shaft, rust, scaling and the like generated by the shaft and a drilling tool are also generated, and when a well group is subjected to reverse water injection circulation, the salt crystals can form blockage in the filter screen or the filter screen pipe.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

In view of the above-mentioned shortcoming and the not enough of prior art, the utility model provides a casing pipe hinders sand device in pit, it has solved detritus, rust, scale deposit and salt crystallization and has easily caused the technical problem of casing pipe jam.

(II) technical scheme

In order to achieve the above object, the utility model discloses a casing hinders sand device in pit includes:

the pipe comprises a pipe body, wherein joints are arranged at two ends of the pipe body, a plurality of through holes are formed in the side wall of the pipe body, the central axis of each through hole is intersected with the central axis of the pipe body, and the included angle between the central axis of each through hole and the inner surface of the pipe body is an acute angle;

a plurality of sand blocking assemblies located within the tubular body;

the sand blocking assembly comprises an installation part and a sand blocking part, and the installation part is arranged in the through hole; hinder sand portion and include many steel wires, many the first end of steel wire all is connected with the installation department, many the second end of steel wire separates each other and is the form of dispersing.

Optionally, the through holes are sequentially arranged in a spiral manner along the length direction of the tube body, or the through holes are arranged in a staggered manner along the length direction of the tube body.

Optionally, the mounting portion is welded in the through hole by a welding material.

Optionally, the solder material is copper.

Optionally, the diameter of the through hole is less than or equal to 8 mm.

Optionally, the diameter of the steel wire is less than or equal to 0.5 mm.

Optionally, the inner surface of the tubular body is smooth.

Optionally, the pipe body comprises a first interface end and a second interface end, the first interface end and the second interface end are both provided with external threads, the first interface end is connected with a casing pipe for conveying saline water, and the second interface end is connected with a pipe shoe;

the steel wire inclines towards the second interface end, and an included angle between the steel wire and the inner surface of the pipe body is a set angle.

Optionally, the set angle is greater than or equal to 15 degrees and less than or equal to 45 degrees.

(III) advantageous effects

The utility model discloses utilized bionics principle, implanted the steel wire or other hair form materials of similar human vibrissa structure at the internal surface of body, when the sand grain flowed through the body along with brine, the prevention of the steel wire of sand subassembly is hindered and can't get into the sleeve pipe, and brine can get into in the sleeve pipe through the clearance of the steel wire of hindering the sand subassembly. Salt crystallization, rust and the scale layer spalling material generated in the shaft are attached to the steel wire, the salt crystallization, the rust and the scale layer spalling material are discharged into the dissolving cavity through reverse circulation washing, and the cleaning efficiency and the cleaning quality are effectively improved through the inclined arrangement of the sand prevention assembly.

Drawings

Fig. 1 is a partial sectional view of a first view angle of the downhole casing sand blocking device of the present invention;

fig. 2 is a cross-sectional view of a second view angle of the downhole casing sand blocking device of the present invention.

[ description of reference ]

1: a pipe body; 11: a first interface end; 12: a second interface end;

2: a sand blocking assembly; 21: an installation part; 22: a sand blocking part;

3: a through hole;

α: and setting an angle.

Detailed Description

For a better understanding of the present invention, reference will now be made in detail to the present invention, examples of which are illustrated in the accompanying drawings. In which the terms "upper", "lower", etc. are used herein with reference to the orientation of fig. 1.

For a better understanding of the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

The utility model provides a casing pipe hinders sand device in pit, as shown in figure 1, it includes body 1 and a plurality of sand subassembly 2 that hinder. Wherein, the both ends of body 1 are the opening and all are provided with the joint, have seted up a plurality of through-holes 3 on the lateral wall of body, and the diameter less than or equal to 8mm of through-hole 3, through-hole 3 are used for the installation to hinder sand subassembly 2, and the installation is convenient, easily processing preparation. Hinder sand subassembly 2 and be located body 1, hinder sand subassembly 2 and include installation department 21 and hinder sand portion 22, installation department 21 sets up in through-hole 3. Hinder sand portion 22 and include many steel wires, the diameter less than or equal to 0.5mm of steel wire, the first end of many steel wires all is connected with installation department 21, and the second end of many steel wires separates each other to be the form of dispersing. The axis of through-hole 3 intersects with the axis of body 1 to the contained angle of the axis of through-hole 3 and the internal surface of body 1 is the acute angle, consequently, installs the steel wire in through-hole 3 and also can incline to specific angle, and when brine got into in the body 1, flows against the incline direction of steel wire. The utility model discloses utilized bionics principle, implanted the steel wire or other hair form materials of similar human vibrissa structure at the internal surface of body 1, when the sand grain flowed through body 1 along with brine, the prevention of the steel wire of sand subassembly 2 that is hindered and can't get into the sleeve pipe, and brine can get into in the sleeve pipe through the clearance of the steel wire of sand subassembly 2 that hinders. Salt crystals, rust and scale layer stripping matters generated in a shaft need to be discharged into a dissolving cavity through reverse circulation, flushing water enters the pipe body 1 from the first interface end 11 and then flows out of the pipe body 1 from the second interface end 12, the flushing water flows through the pipe body 1 along the direction of a steel wire, so that impurities such as rock debris, rust, scale, salt crystals and the like attached to the steel wire are effectively flushed, and the sand blocking component 2 cannot generate an interference effect.

As shown in fig. 2, the through holes 3 are sequentially and spirally arranged along the length direction of the pipe body 1, or the through holes 3 are staggered along the length direction of the pipe body 1, so that the inner cavity of the whole pipe body 1 can be filled with steel wires, and the filtering effect is improved.

Further, installation department 21 passes through the braze welding in through-hole 3, and the braze welding can guarantee the leakproofness of body 1, avoids brine to take place the condition of leaking, and the corrosion resistance of the welding point of assurance again avoids the welding point to take place to corrode and leak because of receiving brine to soak for a long time. The sand trap assembly 2 is also very easy to mill away when it needs to be removed.

Preferably, the internal surface of body 1 is the smooth surface, is favorable to the quick circulation of brine, simultaneously, when carrying out the backwash to the impurity on hindering sand subassembly 2, is convenient for impurity along the quick landing of glossy internal surface to dissolving the intracavity.

As shown in fig. 1, the pipe body 1 includes a first interface end 11 and a second interface end 12, both the first interface end 11 and the second interface end 12 are provided with external threads, the first interface end 11 is connected with a casing for conveying brine, and the first interface end 11 is directly connected to an inlet end of the casing to prevent impurities from entering the casing. The second interface end 12 is used to connect a shoe through which it is connected to other delivery equipment. The method has the advantages of simple operation, easy processing and manufacturing, low cost, no increase of the difficulty of casing pipe downhole operation, well cementation and other operations, and no use technical conditions of other borehole operations. The steel wire inclines to the second interface end 12, and the included angle between the steel wire and the inner surface of the tube body 1 is a set angle alpha, and the set angle alpha is greater than or equal to 15 degrees and less than or equal to 45 degrees. When filtering brine, brine gets into in the body 1 from second interface end 12, gets into the sleeve pipe after flowing out from first interface end 11 again, and during brine got into body 1 against the orientation of steel wire, impurity and the crystal in the brine were filtered effectively to the steel wire. During back flushing, flushing water enters the pipe body 1 from the first interface end 11 and then flows out of the pipe body 1 from the second interface end 12, and the flushing water flows through the pipe body 1 along the direction of the steel wire, so that impurities such as rock debris, rust, scale, salt crystals and the like attached to the steel wire are effectively flushed. The faults like filter screen blockage can not be generated, and the blockage generated in the well can be easily discharged.

The utility model discloses utilized bionics principle, implanted the steel wire or other hair form materials of similar human vibrissa structure at the internal surface of body 1, when the sand grain flowed through body 1 along with brine, the prevention of the steel wire of sand subassembly 2 that is hindered and can't get into the sleeve pipe, and brine can get into in the sleeve pipe through the clearance of the steel wire of sand subassembly 2 that hinders. Salt crystals, rust and scale layer stripping substances generated in the shaft need to be discharged into the dissolving cavity through reverse circulation, and the sand-blocking component 2 does not have an interference effect. The downhole casing sand blocking device can also be used in combination with a screen pipe. The underground casing pipe sand blocking device can be used for salt mines, oil wells, natural gas wells, production wells of soluble deposits such as trona, mirabilite and the like, and other similar mineshafts.

In the description of the present invention, it is to be understood that the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium; either as communication within the two elements or as an interactive relationship of the two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless otherwise expressly stated or limited, a first feature may be "on" or "under" a second feature, and the first and second features may be in direct contact, or the first and second features may be in indirect contact via an intermediate. Also, a first feature "on," "above," and "over" a second feature may be directly or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lower level than the second feature.

In the description herein, the description of the terms "one embodiment," "some embodiments," "an embodiment," "an example," "a specific example" or "some examples" or the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

While embodiments of the present invention have been shown and described, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that modifications, alterations, substitutions and variations may be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims

1. A downhole casing sand blocking device, comprising:

a plurality of sand blocking assemblies located within the tubular body;

2. The downhole casing sand blocking device of claim 1, wherein a plurality of the through holes are sequentially arranged in a spiral manner along the length direction of the pipe body, or a plurality of the through holes are staggered along the length direction of the pipe body.

3. The downhole casing sand blocking device of claim 1 wherein the mounting portion is welded within the through bore by a weld material.

4. The downhole casing sand stop arrangement of claim 3, wherein the weld material is copper.

5. The downhole casing sand blocking device of any one of claims 1 to 4, wherein the diameter of the through hole is 8mm or less.

6. The sand blocking device of any one of claims 1 to 4, wherein the diameter of the wire is 0.5mm or less.

7. The downhole casing sand stop according to any one of claims 1 to 4, wherein the inner surface of the tubular body is smooth.

8. The downhole casing sand blocking device according to any one of claims 1 to 4, wherein the tubular body comprises a first interface end and a second interface end, wherein the first interface end and the second interface end are both provided with external threads, the first interface end is connected with a casing for conveying brine, and the second interface end is connected with a casing shoe;

9. The downhole casing sand blocking device of claim 8, wherein the set angle is 15 degrees or greater and 45 degrees or less.